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require "active_support"
module Rails
module Command
module Behavior #:nodoc:
extend ActiveSupport::Concern
class_methods do
# Remove the color from output.
def no_color!
Thor::Base.shell = Thor::Shell::Basic
end
# Track all command subclasses.
def subclasses
@subclasses ||= []
end
protected
# This code is based directly on the Text gem implementation.
# Copyright (c) 2006-2013 Paul Battley, Michael Neumann, Tim Fletcher.
#
# Returns a value representing the "cost" of transforming str1 into str2.
def levenshtein_distance(str1, str2)
s = str1
t = str2
n = s.length
m = t.length
return m if (0 == n)
return n if (0 == m)
d = (0..m).to_a
x = nil
# avoid duplicating an enumerable object in the loop
str2_codepoint_enumerable = str2.each_codepoint
str1.each_codepoint.with_index do |char1, i|
e = i + 1
str2_codepoint_enumerable.with_index do |char2, j|
cost = (char1 == char2) ? 0 : 1
x = [
d[j + 1] + 1, # insertion
e + 1, # deletion
d[j] + cost # substitution
].min
d[j] = e
e = x
end
d[m] = x
end
x
end
# Prints a list of generators.
def print_list(base, namespaces) #:nodoc:
return if namespaces.empty?
puts "#{base.camelize}:"
namespaces.each do |namespace|
puts(" #{namespace}")
end
puts
end
# Receives namespaces in an array and tries to find matching generators
# in the load path.
def lookup(namespaces) #:nodoc:
paths = namespaces_to_paths(namespaces)
paths.each do |raw_path|
lookup_paths.each do |base|
path = "#{base}/#{raw_path}_#{command_type}"
begin
require path
return
rescue LoadError => e
raise unless e.message =~ /#{Regexp.escape(path)}$/
rescue Exception => e
warn "[WARNING] Could not load #{command_type} #{path.inspect}. Error: #{e.message}.\n#{e.backtrace.join("\n")}"
end
end
end
end
# This will try to load any command in the load path to show in help.
def lookup! #:nodoc:
$LOAD_PATH.each do |base|
Dir[File.join(base, *file_lookup_paths)].each do |path|
begin
path = path.sub("#{base}/", "")
require path
rescue Exception
# No problem
end
end
end
end
# Convert namespaces to paths by replacing ":" for "/" and adding
# an extra lookup. For example, "rails:model" should be searched
# in both: "rails/model/model_generator" and "rails/model_generator".
def namespaces_to_paths(namespaces) #:nodoc:
paths = []
namespaces.each do |namespace|
pieces = namespace.split(":")
paths << pieces.dup.push(pieces.last).join("/")
paths << pieces.join("/")
end
paths.uniq!
paths
end
end
end
end
end
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